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Birds of Chignik Lake: Canvasback – the Duke of Ducks

Canvasbacks and a female Common Goldeneye shyly paddle across Chignik Lake. The first, second and fourth birds from the left are female. The third bird, with its dark head and black bill, is a male. (November 27, 2017)

Hunted ducks are wary ducks, and so it is with the few Canvasbacks that visited Chignik Lake. Generally mixed in with other species, their propensity to turn and paddle out of camera range made scaup and even goldeneyes seem tame by comparison.

That big, dark bill – adapted to pull up aquatic vegetation – helps ID Canvasbacks among other ducks. A light reddish brown head with a pale eye-stripe ID’s this particular pair as females. (Chignik Lake, January 25, 2017)

This is another species not indicated for the Alaska Peninsula on most range maps. As they appear to be pushing further north, in future years they may become more common on the Peninsula. With beds of aquatic vegetation expanding in Chignik Lagoon and throughout the drainage, habitat for Canvasbacks looks promising.

As with other genus Aythya ducks, Canvasbacks are divers. Eclectic in their diets, while they show a preference for Wild Celery (which doesn’t look at all like celery) at certain times of year, they also eat mollusks and aquatic insects. Seldom going ashore, they even sleep on the water, as the drake (the duck on the right) in this photo is getting ready to do. (Chignik Lake, November 27, 2017)

A member of the tape-grass family, Wild Celery, (Vallisneria americana) is a freshwater plant that tolerates salt well enough to thrive in estuarine environments as well. Photo by Fredlyfish4,Wikipedia.

Female Canvasback with female Greater Scaup. At an average length of 24 inches, Canvasbacks are large. The manner in which the head slopes into the bill, creating one straight line, is a reliable field marker. (Chignik Lake, January 25, 2017)

Canvasback Aythya valisineriaOrder: AnseriformesFamily: AnatidaeAythya: from Ancient Greek, a term used by Aristotle believed to describe a duck or seabirdvalisineria: Vallisneria americana, the wild celery which is a favorite food. Antonio Vallisneri was the seventeenth century Italian botanist who named the plant.

Status at Chignik Lake, 2016-19: Uncommon to Rare late Fall and Wintertime